198 Keysight InfiniiVision HD3-Series Oscilloscopes User's Guide
14 Measurements
Counter
The InfiniiVision HD3-Series oscilloscopes have an integrated hardware frequency
counter which counts the number of cycles that occur within a period of time
(known as the gate time) to measure the frequency of a signal.
The gate time is the horizontal range of the oscilloscope but is limited to >= 0.1 s
and <= 10 s. Unlike other measurements, the Zoom horizontal timebase window
does not gate the Counter measurement.
The Counter measurement can measure frequencies up to the bandwidth of the
oscilloscope. The minimum frequency supported is 2.0 / gateTime.
The hardware counter uses the trigger comparator output. Therefore, the counted
channel's trigger level (or threshold for digital channels) must be set correctly.
Analog and digital channels can be selected as the source.
Only one Counter measurement can be displayed at a time.
+ Width
+ Width is the time from the middle threshold of the rising edge to the middle
threshold of the next falling edge. The X markers show the pulse being measured.
The Y marker shows the middle threshold point.
Figure 40 Isolating an event for Frequency measurement
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